Spinning spindle



April 27, W37. s. R. BERGMAN 2,078,789

SPINNNG SPINDLE Filed Dec. 8, 1953 l d aies Patented Apr. 2.7, 1937 v2,078,789 SPINNING SPINDLE Sven R. Bergman, Nahant, Mass., assigvnor toGeneral Electric Company, a corporation of New York Application Decembers, 1933, semina. 701,478

(ci. 24a-26) 4 Claims.

My invention relates to a mounting for securing spinning spindles to aspinning frame.

At certain speeds called critical speeds the spindle shaft is distortedfrom the axis of rotation by centrifugal force and, while rotating inthe distorted position, causes severe vibrating forces to be transmittedto the bearings in which the shaft rotates. The speeds at which thecritical speeds occur dependv upon the stiffness of the shaft, theinertia of the rotating and stationary parts, and the character of themounting which is used to secure the spindle to the spinning frame.Since it is not feasible to operate a spinning spindle at a speed lowenough to avoid any criti- 15 cal speeds and, since the severe vibrationcaused at a critical speed renders the spindle unsafe for operating atthat speed, it is necessary to choose `the normal running rangevof thespindle so that it occurs between two of the critical speeds of the a,shaft and to resiliently mount the spindle to lessen the strain on thebearings caused by the vibrations while the shaft is passing through acritical' speed. p An object of my invention is to provide an improvedand simplified mounting for fastening a spinning spindle to a spinningframe.

Another object of my invention is to provide an improved mounting forresiliently securing a spinning spindle to a spinning frame in which the,)V critical speeds of the spindle are widely separated to provide awide speed range between th second and third critical speeds thereof.

Further objects and advantages of my invention will become apparent asthe following description proceeds, and the features of novelty whichcharacterize my invention will be pointed out withparticularity in theclaims annexed to and form.- ing a part of this specification.

For a better understanding of my invention,

ing in which Fig. 1 is a perspective view of a mounting embodying myinvention applied to a motor-driven spindle for spinning artificial silkor the like; Fig. 2 is an enlarged sectional view of the mounting shownin Fig. 1; and Fig. 3 is an outer *casing* I drives a vertical spindleshaft 2 carried in suitable guide and -thrust bearings in the casing.'The spindle shaft extends above the motor casing and has a spinningdevice or the like, such as a bucket 3 mounted on the upper end.

reference may be had to the accompanying drawthe form of a vcylindricalring 4 attached to the lower end or base of the motorv casing by bolts5, thereby providing a cup-shaped enclosure on the lower portion of themotor casing. The inner 4 member 6 which acts as a supporting member issecured to the spinning frame 1 by means of a nut 3 threaded on thesupporting member I5. An annulus of rubber or other resilient materialII is secured between the opposed walls of members 4 and li. Parts iland 6 of the mounting are concentric with the spindle shaft 2 and haveopposed walls extending along and parallel to the axis of the shaft. Theresilience of the mounting is obtained from the rubber which is securedbetween the parts 4 and 6 of the mounting. The rubber is preferablyplaced between the opposed Walls of parts i and B in an uncured stateand vulcanized in position While subject to pressure acting on theexposed edges of the rubber. 'Ihe pressure causes the rubber to flow andll depressions I2 in each of the parts of the mounting to assist inholding the rubber in place. By this method of assembly, the rubber,although not actually bonded to the opposed walls, is secured betweeneach of the walls so that there is no movement between the surface ofthe rubber and the adjacent wall to cause Wear on the rubber or to allowturning of the motor casing with respect to the supporting member. ofthe rubber may be coated with an oil or acidresisting varnish or othersuitable coating which will prevent deterioration of the rubber.However, due to the shielding effect of the outer part i of themounting, the rubber is well protected without the varnish coating.

Turning of the spindle mounting in the spinning frame is prevented by awasher 9 clamped between the frame `I and nut 8. Pins IIJ on the washerwhich t in corresponding holes in the The exposed edges I3 3 IIJ part 4tends to prevent the transmission of these forces tothe bearings inwhich the shaft is carried. Since the mounting is relatively elastic torocking forces, the first and second critical speeds occur at lowerspeeds than would be the case if the mounting were relatively rigid to.rockingk forces. The forces due to the third critical speed of the shafttend to cause radial movement of the part 6 with respect to the part 4.This mounting is relatively rigid to forces radial to the axis of theshaft, since the forces in this direction cause compression of therubber between the membere 4 and 6, and rubber is relatively rigid incompression. Rigidity in a radial direction is a desirablecharacteristic of the mounting since the third critical speed of theshaft is thereby caused to occur at a higher speed, `and the operatingvrange between the second and third critical speeds is increased. Withthis type of mounting, it is possible to vary the resistance to rockingforces, thereby adjusting the second critical speed of the shaft,without substantially affecting the resistance to radial forces with theconsequent changing of the third critical speed. It is desir- -Y ablethat the mounting be located at the base or lower end of the motor sincea mounting which is relatively elastic to rocking forces and relativelyrigid to radial forces when so placed widens the range between thesecond and third critical speeds of the spindle shaft.

In Fig. 3 I have shown a preferred form of my invention. The outer vpartof this mounting comprises a ring I4 secured to the base of the motorcasing I by means of bolts I5, thereby providing a cup-shaped enclosureon the lower portion of the motor casing. The inner part of the mountingwhichl acts as the supporting member consists of parts I6 and I1 whichare secured tom gether by rivets I8 and by a bolt I9. A nut 8cooperating with threads on the member I 6 secures the mounting to thespindle frame 'l as in the construction shown in Fig. 1. 'Ihe outer andinner members I4, and IB and I1 respectively, have substantiallyparallel opposed walls concentric with and extending along the axis ofthe spindleshaft and aring outwardly therefrom to.

form a double taper. 'I'he walls are preferably of wedge-shapedconfiguration, as shown in the drawing. An annulus of rubber 20, securedbetween the opposed walls of member I4 and members I6 and I'I, providesthe cushioning action of the mounting. The mounting may be assembled byplacing a strip of rubber in the uncured state between parts I4 and I6,securing part Il to part I6 by means of bolt .I9 and `rivets I8, andvulcanizing the rubber in position while subject to pressure acting onthe exposed edges 2|. The exposed edges 2I of the rubbermay be coatedwith aprotective varnish. The action of this mounting is similar to thatof the mounting shown in Fig. 2, except that the forces which tend torock rthe motor are resisted by'combined shear and bre stress of therubberl 2G. I find that'by varying the angle of taper in the opposedwalls of the mounting, the resistance to the rocking forces produced byvibration of the spindle may readily be changed without substantiallyaffecting the resistance offered by the mounting to radial forces. Theresistance to the Yrocking forces may also be Varied by changing thethickness cf the rubber.

In the foregoing description reference is made to the first, second, andthird critical speeds 'of frame or the like.

the spindle shaft. In referring to these critical speeds of the spindleshaft, it will be understood that I mean the spindle shaft in the systemincluding the spinning bucket 3 mounted on the shaft, the motor rotormounted on the shaft, and the stator I, all of which are carried by therubber mounting indicated at I I or 20.

Although I have shown a particular embodiment of my invention, I do notdesire to be limsure, a supporting member concentric with the axis ofthe shaft and extending within said ring, said ring and said supportingmember having opposed walls extending along the axis of the shaft,

resilient material arranged within said cupshaped enclosure and securedbetween said opposed walls, and means for fastening said supportingmember to a spinning frame or the like.

2. A mounting for an electric motor having a vertical spindle shaftextending therefrom comprising a ring concentric with the axis of theshaft secured to the base of the motor and cooperating therewith to forma cup shaped enclosure, a supporting member concentric with the axis ofsaid shaft and extending within said ring, said ring and said supportingmember having substantially parallel opposed walls of doublefrusto--conical configuration, resilient material arranged within saidcup-shaped enclosure and secured between said opposed walls, and meansfor fastening said supporting member to a spinning frame or the like.

3. A mounting for an electric motor having a vertical spindle shaftextending therefrom comprising a ring concentric ,with the axis of theshaft secured to the base of the motor and cooperating therewith to forma cup-shaped enclosure,

a supporting member concentric with the axis of the shaft and extendingwithin said ring. said ring and said supporting member havingsubstantially parallel opposed walls of wedge-shaped configurationextending along the axis of the shaft, resilient material arrangedwithin said 'cupshaped enclosure and secured between said opposed walls,and means for fastening ,said supporting member to a spinning frame orthe like.

4. A mounting for an electric motor having a vertical spindle shaftextending therefrom comprising a ring concentric with the axis of theshaft secured to the base of the motor and cooperating therewith to forma cup-shaped enclosure, a supporting member concentric with the axis` ofthe shaftand extending within said ring, said ring and said supportingmember having substantially parallel opposed walls extending along theaxis of the shaft and having a double taper from the axis of the shaft,resilient material arranged within said cup-shaped enclosure and securedbetween said opposed walls, and means for fastening said supportingmember to a spinning SVEN R. BERGMAN.

